Abstract: On the basis of fuzzy theory, three models are applied to assessing the water quality in the Diantou on Juhe River, this paper discusses the problems existing in each model, then puts forward a weighted-fuzzy comprehensive model of environmental quality assessment.It is indicated by an example analysis that it is more suitable and more reasonable for quality estimation. Water environment of Juhe River is getting better year and year, its conclusion is consistent with the actual condition.